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1// SPDX-License-Identifier: GPL-2.0 OR MIT2/*3 * Copyright 2014-2022 Advanced Micro Devices, Inc.4 *5 * Permission is hereby granted, free of charge, to any person obtaining a6 * copy of this software and associated documentation files (the "Software"),7 * to deal in the Software without restriction, including without limitation8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,9 * and/or sell copies of the Software, and to permit persons to whom the10 * Software is furnished to do so, subject to the following conditions:11 *12 * The above copyright notice and this permission notice shall be included in13 * all copies or substantial portions of the Software.14 *15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR21 * OTHER DEALINGS IN THE SOFTWARE.22 */23 24#include <linux/types.h>25#include "kfd_priv.h"26#include "amdgpu_ids.h"27 28static unsigned int pasid_bits = 16;29static bool pasids_allocated; /* = false */30 31bool kfd_set_pasid_limit(unsigned int new_limit)32{33 if (new_limit < 2)34 return false;35 36 if (new_limit < (1U << pasid_bits)) {37 if (pasids_allocated)38 /* We've already allocated user PASIDs, too late to39 * change the limit40 */41 return false;42 43 while (new_limit < (1U << pasid_bits))44 pasid_bits--;45 }46 47 return true;48}49 50unsigned int kfd_get_pasid_limit(void)51{52 return 1U << pasid_bits;53}54 55u32 kfd_pasid_alloc(void)56{57 int r = amdgpu_pasid_alloc(pasid_bits);58 59 if (r > 0) {60 pasids_allocated = true;61 return r;62 }63 64 return 0;65}66 67void kfd_pasid_free(u32 pasid)68{69 amdgpu_pasid_free(pasid);70}71